Apparatus for operating automatic telephones



Dec. 25, 1951 M. E. THORNTON APPARATUS FOR OPERATING AUTOMATIC TELEPHONES 8 Sheets-Sheet 1 Filed 001;. 6. 1949 Dec. 25, 1951 M. E. THORNTON APPARATUS FOR OPERATING AUTOMATIC TELEPHONES 8 Sheets-Sheet 2 //V VE/V TOR Filed Oct. 6, 1949 De. 25, 1951 M. E. THORNTON 2,579,983

APPARATUS FOR OPERATING AUTOMATIC TELEPHONES Filed Oct. 6, 1949 8 Sheets-Sheet 3 Dec. 25, 1951 M. E. THORNTON 2,579,983

APPARATUS FOR OPERATING AUTOMATIC TELEPHONES Filed Oct. 6, 1949 8 Sheets-Sheet 4 k 10m 5 I '14 IOZa 'Knrr i i-L Dec. 25, 1951 M. E. THORNTON APPARATUS FOR OPERATING AUTOMATIC TELEPHONES 8 Sheets-Sheet 5 Filed Oct. 6, 1949 ll 9: no. \m Q. r T5 31 o u .3 2.. mm m. u? .fl 13: w I -38 mm 5. Ga o 8. H @LQ em r. A 5* $1 48.

Dec. 25, 1951 M. E. THORNTON 2,579,933

APPARATUS FOR DPERATING AUTOMATIC TELEPHONES Filed Oct 6, 1949 s Sheets-Sheet e Dec. 25, 1951 M. E. THORNTON APPARATUS FOR OPERATING AUTOMATIC TELEPHONES 8 Sheets-Sheet 7 Filed Oct. 6. 1949 Dec. 25, 1951 M. E. THORNTON APPARATUS FOR OPERATING AUTOMATIC TELEPHONES 8 Sheets-Sheet 8 Filed 001;. 6. 1949 Patented Dec. 25, 1951 APPARATUS FOR OPERATING AUTOMATIC TELEPHONES Michael E. Thornton, Los Angeles, Calif.

Application October 6, 1949, Serial No. 119,927

20 Claims. 1

The invention herein described pertains to apparatus for automatically calling telephone numbers without the intervention of any human means, and more particularly to a device that will automatically call a predetermined telephone number on a standard telephone and then transmit a spoken or code message over the regular telephonic circuits in response to an external impulse, and that will accomplish such calling and transmission without any electrical connection between the said device and the said telephonic circuits.

My invention is capable of being used in a wide variety of embodiments. One of these is used in connection with a standard dial telephone and the mechanism will automatically operate the dial. Other inventors have provided devices whereby a telephone number may be automatically called by pushing buttons in proper sequence, each button accomplishing the same purpose as that achieved on the dial telephone When the operator places his finger in any given hole in the dial and rotates the dial until his finger engages the stopping bar. The following specification illustrates various applications of my invention to both types of automatic telephones.

One object of my invention is to provide simple means for adjusting the apparatus so that it will dial the particular telephone number that may be desired.

A further object is to provide a rotating device that will operate the regular telephone dial without having to reverse its direction of rotation each time the dial returns to its rest position.

Another object is to provide mechanism that will accomplish the foregoing purpose without the use of clutching devices.

Another object is to provide mechanism that will simulate many of the motions of the human finger in dialing a number.

Another object is to provide apparatus of such a nature that it will in no way injure the regular telephone equipment, and that will, in fact, produce less wear on such equipment than the dialing that is done by a human operator.

A further object is to provide means whereby the mechanism will be set in operation in response to an external impulse.

Still another object is to provide means to pre vent the device from dialing the preselected number more than one time in the event that the external triggering impulse is continued or repeated before the device has been manually reset for another cycle of operation.

Another object is to provide means for readily ascertaining whether the circuits of the apparatus are in readines to respond to the triggering impulse.

A further object is the provision of means for stopping the rotation 01 the dialing finger as soon as it has dialed the final digit of the number, regardless of how many digits such number may contain.

Yet another object is the provision of means for operating the telephone line button or lever to terminate the use of the line after the expiration of a predetermined interval following the dialing of the number.

Another object is to accomplish the foregoing objects singly or in combination with simpler and more dependable apparatus than has heretofore been available.

Another object of my broad invention is the provision of modifications in which telephone numbers may automatically be called on telephones employing push buttons instead of dials.

In the push button type of mechanism one of my objects is the provision of apparatus that will automatically actuate buttons that are disposed in the same circular arrangement at present used for the holes in a standard telephone dial.

Another object in connection with the push button modLfications is the elimination of any motor excepting the motor driving the mechanism that controls the sequence of operations.

Still another object in connection with the push button forms of my invention is the provision of magnetically operated means for actuating buttons that may be arranged and disposed in any position that may be convenient for the designer.

Still another object is the provision of mechanisms in which a single solenoid is capable of actuating any number of a plurality of push buttons and in which individual solenoids are used only for selecting a push button that is to be so actuated.

Still other objects will appear as the specification proceeds.

In the drawings:

Fig. 1 is a schematic circuit diagram of my invention, in which the various. components of my preferred embodiment are shown symbolically.

Fig. 2 is a .side view of a portion of the apparatus of my preferred embodiment, showing the telephone in phantom, and the mechanical dialing finger in engagement with the telephone dial.

Fig. 3,, on the third page of the drawings, is a 3 modified isometric view of the housing, showing the location of the dialing finger and the lever that operates the telephone line button.

Fig. i is a section of the device of Fig. 2, taken along line 4& of Fig. 2, but oriented 90 degrees counterclockwise.

Fig. 5, on the second page of the drawings, is a section of the device of Fig. 2, taken along line 5-5 thereof, but showing the mechanical dialing finger being wiped out of one of the dial holes by the bar that normally stops the operators finger.

Fig. 6 shows a modification of a portion of my device, in which the operating plunger actuates the dialing finger in a manner different from that illustrated in preceding figures.

Fig. 7 is a section taken on line 'l'! of Fig. 6, showing the mechanical dialing finger, the commutator, the rotary contacts, and the relationship between the dialing finger and the rotary contacts.

Fig. 8 is a schematic circuit diagram showing modifications that may be made in the devices of the previously described figures so that the mechanical finger will actuate push buttons instead of a dial.

Fig. 9 is a schematic circuit diagram illustrating means whereby my invention may be used to actuate push buttons in any sequence regardless of the pattern in which the push buttons may be disposed.

Fig. 10 is a fragmentary elevation, partly in section, showing a form of my invention in which a single solenoid will operate circularly disposed push buttons in any predetermined sequence.

Fig. 11 is a bottom view of the device of Fig. 1G taken on lines I ll I of Fig. 10.

Fig. 12 is a top view of the form of my invention illustrated in Fig. 10.

Fig. 13 shows the mechanism of Fig. 10 with the plunger cf the operating solenoid in the downward position and with one push button selector in the operated position and another in v the rest or inoperative position.

Fig. 14 is a detail of the device of Figs. 10, 11, 12 and 13, this detail being a flexible ring surrounding the selectors and operating in conjunction with the selectors to complete the circuit that energizes the main operating plunger.

The apparatus about to be described will automatically dial a preselected telephone number in response to an external impulse, hold the telephone line open for a predetermined interval to permit the automatic transmission of words or audibl signals, and then hang up" after the mechanism is through with the use of the line. All these things are accomplished without making any electrical connections whatever to the telephone, and no mechanical connection is involved excepting for the temporary use of an operatin lever on the telephone line button. A mechanical finger replaces the human finger in the operation of the dial.

The mechanical finger of my apparatus must of course dial a series of letters or numbers in predetermined order, and a major part of the circuits and components of the apparatus are used for the control of this mechanical finger in its sequence of operations.

The apparatus will more readily be understood if a general idea is first obtained of the operation of the mechanical finger. In Fig. 2, the mechanical finger 495 is shown in one of the holes of the telephone dial I06, indicated in phantom. In dotted lines, this finger is shown i in disengaged position. For the full duration of the dialing operation, the mechanical finger is rotating, but it descends during any given revolution only when it is exactly over the hole corresponding to the letter or number to be dialed, and it moves out of this hole when the hole comes adjacent the stopping bar that normally stops the movement of the human finger when a person is dialing a number. In order that this precision result may be obtained, it is of course necessary that the telephone be placed in the proper relationship or position with respect to the mechanical finger. This requires a concentric arrangement of the dial H16 and the shaft I08. This precise positioning of the telephone is readily obtained by placin the front of the telephone against wall 1119, Figs. 2 and 3, and the left side of the instrument against wall Ill], Fig. 3. The hand unit must previously have been removed from its cradle so that lever 48 may rest upon the button 49, Fig. 2, that switches the phone in and out of circuit. The hand unit then hangs from bracket lH, Fig. 3.

In order that the device may dial a preselected number, it is of course necessary that the apparatus comprise means for setting or adjusting the apparatus for such number. I prefer to accomplish this by means of the patch panel, or system of plugs and jacks, diagrammatically illustrated at i3 and M in the upper center of Fig. 1.

The designations Est, 2nd, 3rd, etc. at theleft of the jacks or sockets in panel I3, refer to the sequence of the letters and numbers that are to be diaied. The jacks designated in this manner are electrically connected respectively to contacts Cl, C2, C3, etc. on deck A of the step Switch l5.

In setting up the particular telephone number that is to be dialed, these sequentially numbered jacks in bank is must be connected to specific jacks in the left bank IQ according to the sequence of the letters and numbers that are to be dialed. For purposes of illustration, let us suppose that this number is Madison 6495. M

is thus the first letter to be considered. Conductor 58, connected to jack Est by means of plug Pi, is therefore connected to one of the jacks in the BMNO series in bank M by means of plu Pia. The second letter in the prefix to be dialed is the letter A. Jack End is therefore connected to one of the jacks in the M30 series by means of conductor H and its plugs P2 and P2a. The third character to be dialed is the Figure 6. Jack 3rd is accordingly connected to one of the jacks in the GMNO series by means of plugs P3 and P311. Jacks ith, 5th and 6th are similarly connected to jacks in the 46-51, SIWXY and EJKL series respectively, as shown in the figure.

The sequence of the various operations performed by my device is controlled by cam l, cam 2 and cam 3, connected for positive rotation to the sequence motor 22, as indicated diagrammatically in Fig. 1. The cams are shown in the off position in which they are automatically left at the end of each cycle of operation.

the circuit arrangement which I have chosen I for purposes of illustration, each cycle of operation is initiated when the circuit across terminals 23 and 2:2 is broken in response to an external impulse. Relay R! is thus normally energized, holding the circuit open across arm 25 and contact 28. The circuit that closes relay BI may be traced as follows: The current flows from power supply 28 through conductors 21, 2 9 and 30 to the coil 3! of relay Bl, then through conductor 32 to terminal 24. When the external circuit 33 across terminals 23 and 24 is closed, as indicated, the current then flows from terminal 23 through conductor 34 to contact 35 of the jack-type single-pole double-throw switch 3?, which is actuated, as indicated, b cam 2. When this cam is in the position shown, blade 36 of switch 37 engages contact 35, with the result that the current flows from blade through conductor 38 to ground. Inasmuch as the opposite side of the power supply is grounded, this completes the circuit and energizes coil SI of relay RI, thus holding arm 25 away from contact 26. As long as this relay is open, my device will not begin its cycle of operations.

If the apparatus has been properly reset for subsequent operation by manually releasing relay R2 after its last previous cycle of operations, arm 39 of this relay will be found on contact at whenever the opening of the external circuit 33 deenergizes the coil 3% of relay RI. When relay RI thus releases arm 25, a circuit is completed the following described manner through the coils of two master relays R3 and that release the telephone line button and start the sequence motor. It has previously been shown that when cam 2 is in the position indicated, wire 3 is grounded through contact 35 and blade of switch 3?. When relay BI is de-energized and arm 25 engages contact 25, current will flow from conductor through conductor ii and arm 25 to contact 26 and thence through conductor 42 to armature so of relay R2. Inasmuch as the previously mentioned ire-setting operation placed arm 39 on contact 49, the current then flows through conductors 4:5 and. to coil of relay R3, and from conductor 53 through conductor 535 to coil E5 of relay R4. The other side of these coils is connected to conductor which in tu n. is connected to the power supply unit 28 thr conductors 29 and 21.

The energizing of the master relays R3 and R4 in the manner just described, causes lever as to be lifted from the telephone line button 49, thus opening the telephone line circuit, and arm SD of relay R3 is simultaneously brought into engagement with contact 5!. The latter operation closes the circuit from the main power supply lines 52 to the sequence motor 22, it being assumed that switch Si is in the closed position. From line 53 the current flows through switch S fuse Fl, and conductors 5 55 and 55 to armature as of relay R2, and thence through contact 55 and conductor 5? to the sequence motor 22. The other side of this motor is connected to power supply line 52 through conductors 58 and 'lhe energizing of the sequence motor 22 in response to the operation of the master relays, starts the slow rotation of cams i, 2 and 3. These cams of course connected to the motor through the medium of suitable reducing gears. Rotation of these cams through only a small angle results the closing of jack switches or and 63, and blade of jack switch it? leaves contact engages contact 64. The grounded side of the circuit that originally operated the master relays R3 and R5 was completed through blade 35 and contact 35, as previously explained, but when blade 3% leaves contact 35, the ground connection for coils =25 and 53 of these relays is made through blade at and contact 61 of jack switch 52. The current then flows from ground through conductor 65, blade til, contact 6!, and conductors 5?, it and l3 i to one side of coil and from conductor through wires 43 and 44 to one side of coil 45. The opposite end of both of these coils is connected to the hot side of the power supply unit 28 through wires 41, 29 and 2'1. The original circuit to these coils included arm 25 and contact 26 of relay Rl, but inasmuch as these parts are not in the newly completed circuit, the master relays will remain closed irrespective of the condition of relay Rl, which initially started the operation of the mechanism when it released arm 25 in response to the opening of the external triggering circuit 33. The continuance of the cycle of operations is thus not dependent upon the external circuit. When blade 35 assumes its new position against contact 6t, relay is energized by grounding wire 55 through this contact, blade and conductor Wire E6, thus grounded, goes to one side of coil Bl of relay and the other side of this coil is connected to the power supply 28 through wires and 2?. The consequent opera-- tion of relay R2 causes armature 39 to leave contact and engage contact Contact to was in the original circuit that energized the coils of the master relays, but this circuit is no longer operative, function now having been taken over by the cir that was closed when cam i moved blade against contact Si. Inasmuch as relay R2 is of the manual resetting type, armature 35 remains latched against contact 63 for purposes later to be explained.

As soon as cam 3 has moved sufficiently for the spring blade 69 of switch 63 to engage contact it, the dial motor begins to operate. The circuit thus closed may be traced as follows: From the main supply line 53, the current flows through switch SI, fuse Fl, conductors and 55, blade 69, contact ill and'conductors H and I35 to the dial motor 12; and the other side of the dial motor is connected directly to the main power supply line 52. I prefer that this dial motor be of the synchronous type and that suitable reduction gearing be interposed between the motor and the actual dialing mechanism so the latter will rotate at about nine revolutions per minute.

As the dial motor turns, the wiper of th commutator switch it completes a circuit be tween the grounded ring 75 and the particular contacts 75 that happen to be energized during a given revolution of the wiper. This ring is grounded through conductor ll. Leaving the position shown in Fig. 1, the wiper will first ongage contact H, which is connected by wire iii to stepping magnet '59 of the stepping switch 35. The other side of this stepping magnet is connected to the power supply unit through conductors 8!, 82, 8d and 21. The contacts or" this stepping switch are arranged in two decks, A and B, the construction being of a conventional t e available on the market. The momentary 03mlpletion of a circuit by wiper l3 and contact ii thus operates the stepping magnet it, attractlng armature and causing dog at to advance the ratchet wheel 86 by an angular distance of one tooth, thus moving the rotary contacts and 89 to the first stationary contacts of decks A and B respectively. This places rotary con tact 88 on stationary contact Cl, and rotary col tact so on the conducting segment Paw holds the ratchet wheel in this position against the action of the loading spring 93. When the rotary contacts are in this position, an electrical connection is made from contact CI to segment 92 through conductor 9I. This closes a portion of a circuit that is ultimately completed when wiper I3 reaches the particular contact on the commutator that has been electrically connected through the patch panel to contact Ist of the stepping switch.

It should here be stated that each of the ten groups of jacks (I, ZABC, 3DEF, etc.) are connected respectively to the corresponding contact (I, 2, 3, etc. respectively) on the commutator by means of one of the wires in group 94. The actual connections to the commutator contacts have been omitted in the schematic drawing for the sake of greater clarity and simplicity.

Inasmuch as only one of the contacts from I to 9 and on the commutator are electrically connected to any given contact of the CI, C2, C3 series on deck A of the stepping switch, only one of the said ten contacts of the commutator is hot during any given revolution of the wiper arm I3.

The number to be dialed was Madison 6495, and jack Ist in the bank of jacks I3 was accordingly connected to one of the jacks BMNO in bank I4 by means of conductor I6 and the plugs on opposite ends thereof.

Because of the circuit arrangements hereinbefore described, no circuit will be completed after wiper I3 leaves contact II until the wiper reaches the hot contact 0. The circuit then completed will be as follows: From grounded wire H, the current passes through ring I5, wiper I3, contact 6 and one of the wires in group 94 to the jack in which plug Fla is inserted. From plug PM the current passes through conductor I6, plug P I, jack Ist, conductor 95, contact CI, brush 88, conductor 9i, brush 90, segment 92, and conductor 96 to the right side latching relay R5. The other side of this relay is connected to the power supply through conductors 91, 84 and 21. The momentary engagement of wiper I3 with contact 6, thus energized the latching relay R so as to bring bar 08 against contacts 99 and I00. This completes a circuit from ground through contact I90, bar 98, contact 90, conductor I03, and thence through solenoid Iiil, and conductors 84 and TI to the power supply. The resultant energizing of solenoid IOI pulls plunger I02 downward against the action of the keeper spring I04. The latching I relay maintains this circuit connection until released by means later to be described, and the plunger consequently remains depressed until such release is effected.

The function of plunger I02 is to move the mechanical dialing finger I05 into a dial hole or opening against the action of the keeper spring I04. The operation of these mechanical parts will more readily be understood by referring to Fig. 2. The mechanical finger I05 is mounted on an arm I01, which is pivoted at II2 of an extension I I3 of acollar I I4 rigidly mounted on sleeve H5. This sleeve is journaled in plates Ilt and I4. A worm gear II8 is rigidly mounted on this sleeve just above plate H0, and the hub of the worm gear and collar II I restrain the sleeve against longitudinal movement. The integral brush structure I3 is also rigidly mounted on sleeve H5, which asses through an opening H9 in the stationary commutator I4. A worm I20 meshes with worm gear H3. This worm is rigidly attached to shaft I2I of motor I2, Figs. 1 and 4. By virtue of these positive connections, all the members mounted on sleeve H5 turn as a unit whenever the motor I2 is running. The

contacts I to 9 and0 on the commutator have the same angular spacing as the corresponding holes in the telephone dial, Fig. 5, and the brush structure I3, Figs. 1, 2 and 4, and the mechanical finger are so positioned on sleeve H5 that when brush I3 is passing over any given contact, the mechanical finger will be directly over the corresponding hole in the dial. The upper end of shaft I08 is operatively connected to plunger I02, and the lower end is pivoted at I22 to the arm I0I that carries the mechanical finger.

When wiper or brush I3 passes over contact 0, as explained in the second preceding paragraph, the mechanical finger will be exactly over hole MNOG in the dial. The downward movement of the plunger in response to the completion of the circuit by wiper I3 and contact 0, Fig. 1, consequently moves shaft I08, Fig. 2, downward, pressing finger I05 into hole 6. Inasmuch as the finger is constantly revolving, it will rotate the dial with it until the plunger is de-energized. Such deenergizing takes place when wiper l3 passes over contact II, Fig. 1. It has previously been explained that engagement with this contact grounds conductor 18. This conductor is connected to the side of the latching relay R5 that unlatches bar 93, thus opening the circuit across contacts 99 and I00. This opens the previously traced circuit to solenoid IZII, and its consequent ole-energizing releases the plunger I02, permitting spring I04 to pull up on the plunger and the connected shaft 38, which then pulls finger I05 out of the dial hole. The dial then returns to its normal position in its customary manner.

It was previously explained that the completion of a circuit with contact I I also operates the stepping magnet I0 of stepping switch I5. This causes the rotating contact 08 to advance to the next stationary contact C2 of the stepping switch. By virtue of the connections set up on the patch panel, this completes a circuit as far as contact 2 of the commutator I6. When wiper I3 reaches this contact, a circuit will again be completed to the right side of the latching relaythis time at the exact instant that the mechanical finger is over hole ABC2 in the dial.

Bar 98 then closes the circuit to the solenoid Hill, and the parts connected to the plunger are again pulled down, forcing the mechanical finger this time into the proper hole to dial the A in Madison. The finger will withdraw when wiper I3 again reaches contact II. This will advance the rotating contact 88 of the stepping switch to another stationary contact on the stepping switch, thus completing a circuit to another of the commutator contacts so that the next sweep of wiper I3 will cause the dialing of the next number in sequence. This procedure continues until the selected number has been completely dialed.

After the mechanical finger has thus dialed the completed number, further rotation of the finger and the rotary contact I3 is not required. The apparatus accordingly embodies means whereby the motor i2 is de-energized after the finger has made as many revolutions as there are letters and digits in the number to be dialed. Inasmuch as the number of digits is variable, I prefer that the motor circuit be broken by some other means than cam 3 which originally closed the circuit. It will be remembered that the dial motor Was initially started when cam 3 turned sufflciently for blade E3 of knife switch 63 to slip off the portion of the cam having the larger radius, this blade then coming into engagement with contact 10. If this cam were also to be used for breaking the motor circuit, the break would occur as soon as the portion of the cam having the reduced. radius had passed the tip of blade 69. Inasmuch as the cam rotates at a fixed speed, the dial motor would always operate for a fixed period of time if this cam were to control the stopping as well as the starting or the motor. In order that the motor may be die-energized. automatically as soon as the last digit in the number has been dialed, my device comprises means whereby the apparatus may be adjusted so that the motor will stop after performing the exact number dialing operations required for the specific telephon number to be dialed. Control of the motor circuit must accordingly be taken away from earn 3 as soon as the stepping switch starts to operate. This is done in the following described manner. When the ratchet wheel of the stepping switch has turned suficiently for n 65 to move away from the cam-shaped portion of leaf spring E45, this leaf moves against contact Hill. This com petes a circuit from ground through contact Ml, leaf MS and wires M8 and H6 to coil M9 of relay RI. circuit remains closed as long as rotary contact is is in engagement with any of the stationary contacts of deck A of the stepping switch. The energizing of coil its of relay Pol, causes armature the of this relay to be drawn into engagement with contact E55, thus forming another electrical path to the motor in parallel with the path across switch The motor will ccordingly operate as long as current flows through coil t lt of this relay.

The time when this coil will be de-energized is adjust-ably controlled by means of the selector switch If there are only four letters and/or numbers to be dial d, the rotary contact iii of this switch is placed on stationary contact l of selector switch 3%, but there are six letters and numbers to be dialed, as in the number that we have chosen for purposes of illustration, then the rotary contact is placed on stationary con tact 6. These stationary contacts of this se ector switch are electrically conn cted to the stationary contacts of deck B of the step-switch is, each of the selector switch contacts being connected to the contact on deck B that has the next highest number; that is, selector switch contact 4 is connected to contact on deck B, and selector switch contact 5 is connected to contact 6th on deck 13, etc. The last in Madison 6 495 was dialed while the rotary contacts of the step switch were on the 5th stationary contacts of the respec tive decks; but when the wiring contact '13 of the commutator is r commutator contact 9!, the resulting electrical in the circuit thus closed will cause the stepping magnet it to advance the movable contacts of the stepping switch to the lib stationary contacts of the r spective de When the number to be dia ed was up on the patch panels, no connections were zero ec. jacks lth, 3th, 53th and lfith of l and a consequence, no circuit is com let d upon the engagement of rotary contact t-h t Cl. Deck B. how ever, now cor es into 1 The Ith contact s See deck B co. ecte l Act of selector switch and it was upon th contact that rotary because there were si number be contact is? was placed and di,

Rotary contact connected by wire to tater Qn preone e over the was i energized, but on this seventh revolution a circuit completed from R3 and R 5.

grounded ring 15 through wiper is to contact l2, and thence through conductor #38, rotary contact it], contact 5, conductor 53s, stationary contact 5th of deck B, rotary contact 539, conductor i i-3, rotary contact Mil, segment t ll and conductor M2 to coil i l of relay RE. The other side of coil M l is connected to the high potential side or" the current supply by means or" conductors 83, 5 and 2?.

When relay is thus energized, the doublepole, single-throw switch 552 moves to the closed position. In the closed position, blade 554 is in engagement with contact 555, completing a circuit through the release magnet #53 of the step witch. It has previously been mentioned that conductor 82 is connected to the high potential side of the power supply unit 28 through conductors 2i and 85. Conductor s2 is connected to one side of the release magnet !53 through cenductor [55. The other e of the release magnet is grounded through switch as soon as the coil M4 of relay R6 is energized. When this relay operates, current flows from coil 5 3 through conductor 15?, blade 54 and cont. of switch 52, and then through conductor balde I l-f5 and contact i l? to ground. The consequent energizing of coil 153 causes the release magnet to attract armature lot, to which pawl 3'! is attached. When this pawl is thus pulled away from the ratchet wheel 86, the rotary parts of the stepping switch are pulled toward the rest position by the return spring $3. In order to prevent relay Rt from being tie-energized as soon as the rotary contact 88 leaves the seventh contact of deck B under action of return spring additional contacts are closed by relay RS so coil Hill of this relay will remain energized until the step switch has returned all the way to the rest position. This is accomplished by the en gageinent of blade 1153 with contact lee. Coil M3 of relay R5 is then grounded through wire M2,

coil M4 of relay Be as well as to coil i i-t of relay RT. The de-energizing of relay R? opens circuit to the dial motor ?2 through armature i513 and contact $55, and the de-energizing of relay R5 opens the circuit to the release magnet permitting pawl 8'5 to re-engage the ratchet wheel 35 after the stepping switch has returned to its rest position.

The breaking of the circuit to the dial motor in no way ailects the sequence motor 22, which continues to operate until cams i and '2 have made a complete revolution to the position shown in Fig. 1, thus breaking the circuits to relays B2, In the meantime, lever til remains away from the telephone line button t5, and the telephone line rem .5 open. During the interval between the dialing of the number and the closing of the master relays, the telephone line may be used for the transmission of audible signals through the regular telephone transmitter. The hand set may be hung during this interval on hook ill, Fig. 3. In one embodiment of my invention, a buzzer is located in proximity to hook H i so that the sound of the buzzer may be picked up by the transmitter, and provision is made for the buzzer automatically to emit code signals that indicate the nature of the disturbance that caused the external circuit to open across contacts 23 and 24, Fig. 1. This adaptation or use of my device is not further explained, because the present application is confined to my number-calling mechanism and the associated apparatus that causes this mechanism to operate when the external circuit is broken.

When the external end of blade 39 of switch 62 falls into the recess in cam I upon completion of the revolution that returns this cam to the position shown in Fig. 1, blade 6i! leaves contact 6|, thus opening the circuit to relays R3 and R4. Armature 59 of relay R3 then leaves contact I, opening the circuit to the sequence motor 22. The de-energizing of relay R4 causes lever 48 again to rest on the telephone line button 49, thus closing the telephone circuit.

Cam 2 will then be in the position shown in Fig. 1, and the ground circuit to relay R2 will thus be broken through blade 36 and contact 64. The de-energizing of coil 61 of relay R2 does not permit the return of armature 39 from contact 68, however, because this relay must be manually reset. When the energizing of relay R2 was originally discussed, it was stated that the reason for the latching of armature 39 against contact 38 would later be explained. As long as armature 39 remains away from contact 49, it is impossible for the apparatus to begin-a second cycle of operations in response to the opening of the external circuit 33, because even though the external circuit may leave relay RI de-energized and thus permit its armature to remain against contact 26, the circuit that initially operates the master relays R3 and R4 cannot be completed as long as armature 39 of the reset relay remains away from contact 49. If the apparatus has been used to dial a number so that an alarm may be transmitted to the station dialed, the person or persons responding to such alarm are likely to find the exterenal circuit still open. If all other circuits and parts of the apparatus are in such condition that the external circuit may safely be restored to permit the subseouent operation of the device in response to another interruption of the external c rcuit, the ready light I 2 will glow. Voltage will be app ied to one side of this lamp from the power supply unit 23 through conductors 21 and 29; and the other side of the lamp will be grounded throu h conductor I 3, contact 38. armature 39. conductor 52, contact 2%. ar ature 25. conductors 4| and 34. contact 35, blade 3 and conductor 39. When the external circuit is closed. rel y RI will return to its normal op rated position hereinbefore discus ed. This holds armatur 25 awav from contact 26. and the circuit to the ready l ht is thereby broken. The manual resetting of the manual re-set relay R2 places armature 39 against contact 4 and the whole apparatus is then again in condition to begin its cycle of operations in response to the interruption of the external circuit.

I prefer that the mechanical dialing finger I 05, Figs. 2, 3 and 5, be rotatably mounted on the lever I91. and that it be spring-loaded, as by a spring I34, to a position at right angles to the telephone dial I96. This s ring-loaded construction is a precaution against the possibility that the mechanical finger might strike the stopping oar IE5, Fig. 5, instead of moving completely out or the dial hole immediately at the end of its stroke. If the dial finger were rigidly mounted,

its accidental engagement with the stopping bar might injure either the finger or the bar, or might result in jamming. But with the spring loaded construction this cannot occur, because if the finger engages the stopping bar before it has completely withdrawn from the dial hole, the stopping bar will merely cause the finger to wipe out of the hole and over the stopping bar, as shown in Fig. 5.

In Figs. 6 and '7, I have shown a modified construciion of the dialing finger, actuating lever and commutator. Shaft IIEa corresponds to sleeve H5 in my preferred embodiment shown in Fig. 2, and it is rotated in the same manner as sleeve II 5. The lower end I38 of shaft H3 is provided with external splines I33, as shown in Figs. 6 and '7. Surrounding this externally splined section, I provide an internally splined sleeve I68, its internal splines meshing with the external splines of the shaft. The sleeve is thus free to move longitudinally with respect to the shaft, but there can be no relative angular movement between the shaft and sleeve. This sleeve is integral with the finger arm Iilla, which carries the mechanica1 finger "33a. Arm Idle and finger I951: correspond respectively to arm Iii? and finger IE5 of the previously described preferred embodiment. Sleeve I38 has a circumferential groove M9 to receive t -e tines I'it of the forked end of lever I? I. A stub shaft H2, rigidly mounted in a bracket I13, passes through a longitudinal slot H4 in lever Ill, and the lever is free to slide as well as to rotate on the stub shaft. The non=forked end of lever Ill is pivoted at I75 to extension i98a of plunger I92a, this plunger performing the same function as plunger I82 of the previously described embodiment. Solenoid I3 I a is actuated in the same manner as solenoid Iili, but it draws upward, instead of downward, on its plunger illZa. When plunger iiiZa is thus drawn into the solenoid, the extension 38a pulls up on the left end of lever I'II against the action of the keeper spring E3412, and the tined end of the lever moves sleeve I38 in the direction of dial Iiifia (shown in phantom). Finger H1512, attached to sleeve :68 by the integral arm IIl'Io, is accordingly lowered into the aligned opening in the dial.

In order to make certain of such alignment, the contacts 16a, Fig. 7, of the commutator E ia have the same angular spacing as the dial holes, as was the case with the corresponding commutator contacts of the previously described embodiment; and the rotary contacts I31? and I30, carried by contact arm 13o, are angularly aligned with the dial finger I05a, as shown in Fig. 7. The contact arm 130. is of course rigidly mounted on shaft Ilia. It will be noted that the stationary contacts 76a are here arranged on the under side of the commutator base, instead of on the top as in the form previously described; but in either embodiment the contacts could be arranged on either side.

Various experimenters have proposed push button arrangements whereby telephone numbers may be called by pressing the buttons in proper sequence. Such buttons correspond respectively to the openings in the conventional dial, and the operation of any button causes the same impulses to be transmitted over the telephone line that are transmitted when the user of a dial telephone places his finger in the corresponding dial hole and rotates the dial until his finger strikes the stop bar. If such buttons are arranged in a circle so that they occupy the same positions as the corresponding holes in the conventional dial, it: is necessary to make only slight changes in my dialing mechanism as hereinbefore described in order to use the mechanism for the actuation of such buttons. Fig. 8 is a schematic illus tration of the changes that may be made in the system of 1 so that my mechanism will op crate such push buttons automatically,

The heavy lines in Fig. -8 illustrate new parts and electrical connections that are specific to the push button modification, while the light lines show the conductors and components of Fig. 1 with which the altered circuits are connected. In the embodiments previously described, the mechanical finger rotates continuously during the number-calling process, and there is no cessation of this rotation while the finger is being lowered or raised. When push buttons are used, however, the rotation must cease when any button is to be pressed, and the rotation must not be resumed until such operated button has re turned to its raised or rest position. When the mechanism hereinbeiore described is to be modifled to operate a push button telephone, I accordingly provide means for stopping the rotation of the mechanical finger 2525, Fig. 1, whenever the rotary contact 73, Fig. 1, engages one of the stationary contacts i6 that has been energized by the circuits set up on the patch panels 13 and it. As previously explained, a circuit completed through the patch panels includes the conductor 55 and the right coil of relay The explanation of Fig. 1 showed that energizing of this coil brings the armature of this relay into engagement with contacts 39 and I thereby completing a circuit through solenoid Sill that lowers the mechanical finger Hi against the action of the keeper spring its. In my push button adaptation of this mechanism, another latching relay R8 is connected in parallel with latching relay R5, and the armature 98a of relay R8 rests against contacts H! and lit when the left coil of this relay is energized. These contacts I'll and H8 are placed in series with conductor i355 which energizes the dial motor 12. Fig. 8 shows in a dotted line at l35c the continuity that wire 35 takes in 'the circuits of Fig. 1, but in the Fig. 3 modification wire 535 is broken on opposite sides of the i350 portion, and the upper part of wire S35 continues to the right as wire I which connects to contact .i'l-l. Contact H8 is connected. to conductor [35b which joins the lower part of wire 535. In the push button orrangement, the circuit to the motor throu h conductor 535 thus complete as long as bar remains on contacts Ill and H3, but whenever the rotary contact Fig. l, strikes a stationary commutator contact that has been energized through the patch pane-ls, the consequent ener ginng oi the right coil of relay causes bar 33:; to move to the right, thus breaking the circuit across contacts iii and in, Fig. 8. These contacts are in the dial motor circuit, and the motor consequently stops when bar 913a moves to the right. When bar etc of relay R5 strikes contacts 93 and its, solenoid liil is energized as explained in connection with Fig. 1 and the plunger iJ'Z lowers the mechanical finger. Inasmuch as the ringer is no longer rotating, it merely presses down on the push button that takes the place of the dial hole in this modication. As soon as the top it??? of plunger ii -2, Fig. 8, reaches its bottom position and strikes contact i's, a circuit is completed through the left sides of the latching relays. In the Fig. 8

modification, the top IOZZ) of plunger 532 is grounded as shown, and when. top li ib strikes contact H9, the current flows from ground through conductors 133a, 5-33 and the left coils of relays R5 and R23 which are connected to conductors Sla, er and 8 5, the latter leading to the power supply as explained in connection with the previously described emoodircents. The energizing of the left coil of latching relay R3 brings bar 98a back against contacts ill and lit, thus restoring the circuit to the dial motor. The mechanical finger then resumes its rotation and the operation is the same as in the previously described embodiments until the rotary contact 13 engages another of the stationary contacts I to 9 or L that happens to be energized during the next revolution of the rotary contact. When another hot contact in this group is again encountered, the motor u again stop, and the meehanical finger will pr the button corresponding to the said hot contact. With each successive revolution of the rotary contact over the commutator another of the buttons will be pressed until therotary contact has made as many revolutions as there are digits in the number to be called. If it is necessary the push buttons of the telephone be held down for an interval of time, or that they be let up slowly, and if the buttons themselves are not with means for effecting such delayed action, then the plunger 162 or the solenoid ital may be equipped with of the well known for producing such retarded action,

it is also possible to embody iny ticn in apparatus that will operate push button type of automatic telephone without using a mechanical operating finger. Two such embodiments will be described for purposes of illustration.

In Fig. 9 the ten push buttons that are required for an automatic push button-operated telephone are indicated by the reference characters B! to B8 and B3. A solenoid is disposed immediately above each of these push buttons, these solenoids being designated as etc, to F5 and F6. Each of the solenoids is supplied with a plunger, these plungers being designated by the letter F lollo d by a numeral correbroad invensponding to that used in the reference charactor for the associated solenoids. One side of each of the solenoid coils is grounded as ind'cated in the figure and the other side of each coil is connected to the output side of the patch anel list. This patch panel comprises all of the provisions of patch panels i3 and id or" Jig. 1, including the cords and plugs whereby the contacts of deck A of the stepping switch iii are connected to different output conductors of the patch panel hi. In order to emphasize the common features of the schematic circuit arrangement of rigs. 9 and l, the stepping switch of has been designated by the reference character i and the patch panel is indicated only in block form because the details and connections he's already been described in connection with the sponding patch panels of Fig. i.

In general, the BillbC/"ilr'lfiffll? illus 9 is substantially the same as that D Fig. l with the exception of th ?a motor, commutator and rose Fig. 1 arrangement have bee 9 embodnnent by the and Ft and the associated needless to duplicate a description of the operation of the parts of this embodiment that are identical to those of the Fig. 1 arrangement. The various contacts and conductors have been designated by the same reference numerals and characters used in Fig. l excepting that a lower case (2 has been added to each designation.

In the order in which the components come into play, the first modification from the Fig. l arrangement is the cam 36!. In the Fig. 1 embodiment cam 3 serves to start the dial motor 12, no counterpart of which is used in the Fig. 9 embodiment. Cam Ed is used solely for the purpose of advancing the rotary contacts of the stepping switch from the rest position to the first of the stationary contacts. This is effected by means of intermediate apparatus that will now be described. When cam 3d is in the angular position shown in the figure, blade 69d is held out of engagement with contact led by the portion of the periphery of cam 3d having the maximum radius or unbroken surface. As soon as the sequence motor 220. has been started by the action of relay Red, in a manner precisely the same as that in the Fig. 1 embodiment, cam 361 will turn to a position in which the recess in the periphery will pass under the outer end of blade sea, thus causing this blade can to move to the right into engagement with contact led. The circuit thus completed is as follows: From ground the current passes through blade 59d, contact conductor I8I, coil it?! of solenoid I83, and conductors I36 and 2'id to the current supply 2311, the other side of which is grounded, as indicated in the figure. The energizing of solenoid ltd causes plunger I35 to be drawn down. As this occurs, the projection ass, which is integral therewith, engages the outer end 1837 of the rocker 588. This rocker is pivoted at I89 and is normally held in a horizontal position by the action of spring I90. The engagement of projection E86 with the outer end I8? of rocker I88 completes the circuit to the stepping magnet 19d as follows: Current proceeds from ground through conductor I93, keeper spring 1%, plunger I85, projection mt, rocker I88, spring Ills, conductors till, 592 and 78d to the coil of the stepping magnet 59d and thence through conductors isld, 2%, 8202, Mid, and 21d to the current supply 28d. As projection I86 continues to move downward upon the energizing of the solenoid coil 283 it will, of course, rotate rocker E88, turning it to an angular pcsi-= tion in which the projection I86 will pass below the rocker.

In order to make certain that the engagement of projection 86 with the outer end l8? will produce a current impulse of sufficient duration to cause the stepping magnet to advance the rotary contacts of the stepping switch to the first position, solenoid 532 may be equipped with a suitable dash-pot to retard the downward movement of the plunger 585. This dash-pot is neither shown nor described, as it is a well known mechanical arrangement which, per se, is not novel with the present inventor. Furthermore, other retarding means may alternatively be used to accomplish the same result.

The purpose of the solenoid I83 and its associated plunger and contact rocker is, as previously mentioned, merely to give the impulse that advances the rotary contacts of the stepping switch to the first stationary contact. This impulse takes place only during a momentary engagement of projection I86 with the outer end I8? of rocker I88 and the impulse does not continue durin CAI the entire time that solenoid I83 is energized. As soon as cam 311 has turned sufiiciently far for the recess in the periphery of the cam to move past the outer end of blade 69d, the greater radius of the outer periphery of the cam will cause blade 69d to move away from contact 'IIlcZ, thus tie-energizing solenoid 183. It is important, of course, that the upward movement of plunger I 85 under action of the return spring 19 1 not produce an additional impulse to the stepping magnet as projection I86 again moves past the outer end of the rocker during the upward movement of the plunger. To prevent such additional impulse the under side I91 of the outer end of rocker I88 is formed of insulating material. When the upper portion of projection I86 engages this insulated portion I91 there is, of course, no current flow and projection I86 moves upward past the outer end of the rocker Without any impulse being produced.

At this point it may be well to explain another modification from the arrangement of Fig. 1. The segment contact 9201 of deck A, instead of being connected to a coil of the latching relay such as R5 of Fig. 1, is instead connected by means of a conductor 285 to a contact 202, which in one energized position of relay R8 is in engagement with armature 26I, which at that time also engages a contact 283. This contact is connected to the power supply by means of conductors 206, 82d, Bed and 21d.

The energizing of stepping magnet 19d by the engagement'of projection I86 causes the rotary contacts of the stepping switch I'Ed to advance to the first position, thereby bringing the rotary contact 88d of deck A of the stepping switch into engagement with stationary contact CId. This will complete a circuit to whatever output conductor of the patch panel has been connected to conductor 95d by the advance set-up on the patch panel, as fully described in connection with the species of my invention illustrated in Fig. 1. For purposes of illustration let us assume that this is conductor I95 leading from the plug BMNO, which was the jack initially energized in the dialing of Madison 6495 as described in connection with the species of Fig. 1. Conductor I95 is connected to solenoid F6, the other side of which is grounded as shown in Fig. 9. The circuit from stepping switch thru the patch panels is identical to that described in connection with Fig. 1, but in the instant embodiment the circuit to ground is, of course, completed thru conductor I95 and solenoid F6. The energizing of this solenoid causes plunger P6 to move down against the action of the keeper spring I96 into engagement with button B6, as the operators finger normally would do. As plunger P6 moves downward the cap Q6 engages the outer end of a rocker U6, which is identical in construction and function with rocker I88 excepting that the insulated portion on the outer end is on the top of rocker Us instead of on the bottom as in rocker I88. As a consequence, the cap Q6 touches only the insulating material of rocker US during its downward stroke. When cap Q6 reaches the bottom of its stroke, it engages a contact T6. This completes a circuit that de-energizes solenoid F6 in the following described manner: Current flows from ground through conductor I98, keeper spring I96, cap Q6, contact TS and conductor I99 to the left side of the coil of latching relay R8 and thence through conductors 208, 82d, 84d, and 21d to the current supply unit 2801. The resultant energizing of relay R8 attracts the armature 21H of this relay to the left, thus moving the armature away from contacts 262 and 283. Inasmuch as this armature and these contacts were in series with solenoid F6, due to the fact that they were in circuit between the stationary contact segment 92d and the power supply, the opening of the circuit across contacts 262 and 203 breaks the circuit to solenoid F6. The consequent de-energizing of solenoid F6 permits the plunger P6 to be pulled upward by the keeper spring 596. As the cap Q moves up from its operated position the upper portion of the cap energizes the under side of the outer end of rocker US. This completes the circuit through stepping magnet 59d as well as through the coil of relay R9, the coils of these two magnets being in parallel. Their circuits may be traced as follows: From ground the current proceeds through conductor I98, keeper spring E95, cap Q6, rocker U6, spring 201 and conductors i532 and 18d to the stepping magnet "ltd, from whence the current passes through conductors 8ld, 2M, 82d, fi l-cl and 21d to the power supply unit 23d. The energizing of this stepping magnet, of course, advances the rotary contacts of both decks of the stepping switch to the second stationary contact in each deck. Si multaneous with the passage of the current through stepping magnet ted, the current passes through conductor 268 from conductor I92 and thence through the coil of relay R3 and conductors 209, 286, 82d, 84d and 27d to the power supp v The operation of relay R9 energizes the right coil of relay R8, which action in turn completes a circuit to segment 92d of deck A of the stepping switch 55d. Relay R9 completes a circuit through the right coil of latching relay R8 as follows: From ground the current passes through armature 2H3, contact 2H. conductor M2, the right coil of relay R8 and conductors 200, 82d, 35d and 21d to the power supply. The energizing of the right coil of R8 moves armature 20! into engagement with contacts 202 and 202. This completes a circuit from segment 9211 through conductor 285, contact 282, armature 20L contact 293 and conductors 2|3, 2%, 82d, 84d and 27d to the power supply unit. When the circuit is completed from cap Q5 to rocker US the relay R8 is thus made to operate indirectly through the relay R9, rather than directly. Relay Re is electrically interposed between rocker U6 and relay R8 in order to allow sufiicient time for the stepping magnet led to advance the rotary contact 3802 of the stepping switch [5d to the next succeeding stationary contact before the circuit is completed from the power supply to the stationary segment 92d. Should segment 92d be energized before the stepping magnet has advanced rotary contact add to stationary contact 0202, the current would pass from rotary contact 83d through stationary contact Cid and would again energize solenoid Ft. The time delay effected by the interposition of relay R9 prevents this, and segment 92d is thus not energized until after the stepping magnet has advanced the rotary contact 3-80. to the next succeeding stationary contact. The completion of a circuit from segment std to stationary contact 02d results in energizing another of the solenoids that operate the push buttons, the particular solenoid thus energized depending upon the connections that have been previously set up on the patch panels. When the plunger of such solenoid reaches the .lower end of its stroke the circuit through the solenoid will be broken in the manner previously explained in connection with solenoid FE and the return of the cap of the plunger will complete the circuit through the associated rocker of that particular solenoid, thus advancing the stepping switches in the manner previously explained.

It will be obvious that sufficient time must elapse between the operation of two of the solenoids to permit the automatic switchboards of the central telephone station to respond to the operation of any given push button. Any means well known in the art may be used to effect this necessary time lag between the successive operation of two plungers. This may be accomplished by a dash-pot which will retard the upward movement of the plunger or it may be brought about by electronic-or other expedients.

After the stepping switch has advanced to the last stationary contact required for the calling of the desired telephone number, it is, of course, necessary that the rotary contacts of the two banks of the stepping switch return to the rest position in order to be in readiness for another series of operations in response to the opening of the external circuit across contacts 23d and 24d. In the embodiment illustrated in Fig. 1 the dialing of the final digit in the number is followed by the completion of the circuit through relays that open the circuit to the dial motor. Such circuits are, of course, omitted from this species, and it is merely necessary that the instant apparatus embody means for returning the rotary contacts of the stepping switch to the rest position. This is effected by means of the tap switch I 36d and the relay R801, which correspond generally in function with tap switch 136 and relay R8 of the Fig. 1 species. Contact l31d of the tap switch l36d is shown on contact 6, this rotary contact having been placed on this stationary contact because there are only six letters and digits in Madison 6495, which we are here using for purposes of illustration. In the Fig. 1 embodiment, contact I31 was in circuit with the commutator. In this embodiment rotary contact I3! is connected directly to ground by means of conductor 2H3. From rotary contact l s'ld the current passes through stationary contact 6, conductor 139d, contact 6th, rotary contact 89d, conductor I43d, contact I40, segment Mid and conductor I42 to the coil 14411 of relay Rsd and thence through conductors 84d and 2701 to the power supply unit. The circuits completed by the blades and contacts of Mid are the same as those completed by the operation of relay R6 in the species of Fig. 1 and the various components have therefore been numbered the same as in the earlier described species excepting that in the instant embodiment a lower case d has been added to the numerals. Sufiice it to say that the energizing of relay Rtd operates magnet |53d to opcrate the pawl 81d of the stepping switch in order to return the rotary contacts to their rest posi- After the number has been called by the operation of the solenoids and plungers in the manner described supra, cams id, 2d and 3d will continue to rotate for a period of time sufiicient for the telephone line to be used for the intended purpose and when the cams are rotated to the angular position shown in the figure the sequence motor will be de-energized as explained in connection with the corresponding components and circuits shown in Fig. 1 and described in connection therewith.

-on the right and Bfie shown on the left.

19 Figs. 10, 11, 12, 13 and 14 illustrate still another embodiment of my invention. This species,

like the last one described, actuates the push buttons of an automatic telephone without the use of a mechanical finger. In the instant species a single solenoid actuates all of the push buttons by means of intervening levers that are brought in and out of engagement with a driving member carried by the plunger of the said operating solenoid. These levers. which determine the button that will be operated by any given stroke of the operating solenoid, are moved in and out of engagement with the said driving member by means of ten different solenoids that are individual to the ten levers that are engaged bv the said driving means. In this embodiment the buttons are arranged in a circle much the same as in the previously described embodiment in which the plungers are operated by a me-- chanical finger, the circuit arrangements for which were illustrated in part in Fig. 8.

Fig. is a fragmentary view, partly in section, of the main operating solenoid, two of the selector levers, and other apparatus used for operating two of the push buttons Ble shown Other buttons and levers have been omitted for the sake of clarity. Rods V66 and Vle are disposed respectively above buttons 35c and Ble and are mounted for longitudinal movement in holes or ways provided in the base member 215. Solenoid 216 is mounted in the center of the circle of levers, Fig. 10 showing this solenoid disposed intermediate the selector levers Wfie and WI c. It must be understood, of course, that there are eight other levers disposed in the circle around solenoid 2I6, these additional levers being arranged with respect to the solenoid in the same manner as levers Wfie and Wle are arranged. Plunger 2 ll of solenoid 216 is held in an inoperative or rest position by keeper spring 213. The driving member 2l9 of circularform is centrally mounted on plunger 2H as shown in Figs. 10, 12 and 13. The selector levers are also held up in an inoperative position by means of springs. One of these springs 222 is shown attached to selector lever Wtfe in Figs. 10 and 13, the upper end of this spring being attached to a conducting ring 220 surrounding the upper portion of the solenoid 216. Other springs, like 222, are also attached to this ring as well as to each of the other nine selector levers. It will be noted in Fig. 10 that spring 222 not only holds selector lever Wfie in an upward position but it also urges it against the solenoid-encircling ring 229. A series of 10 holes 22l is arranged in a circle in the driving disc 219 in such a way that the upper end of the selector levers are in alignment with these holes 221 as shown in Fig. 12. Surrounding the solenoid and selector lever assembly there are disposed ten magnets X! to X9 and X3, as shown in the plan view of Fig. 12 and as indicated in elevation in Fig. 10 in which two of these magnets XI and X6 are shown. It will be noted that magnets XI and X6 are ali ned with the projections Y1 and Y8 of selector levers Wle and WEe respectively. This aligned relationship of the cores of the magnets with the projections Y! and Y6 is also shown in Fig. 12.

The magnets XI to X6 are connected to the patch panel in exactly the same manner as the solenoids F I to F9 and F0 in the species of Fig. 9. The species now being described is identical to that shown in Fig. 9 with the exception of the fact that the solenoid, magnet and lever assembly of Figs. 10, 11, 12, 13 and 14 is substituted for the solenoid assembly of the Fig. 9 species. All the electrical connections to the other compcnents of the species are the same as shown in Fig. 9 and it is therefore unnecessary to describe them or to show them in additional figures, which would merely be repetitive.

When'one of the magnets, say Xi, is energized by means of a hot conductor from the patch panel the magnet attracts the extension on the associated selector lever. In Fig. 10 the projection Y! on selector lever Wle has been urged to the right under action of the energized magnet This pulls the selector lever Wle out of alignment with its associated hole 22! in the driving disc 2l9. A flexible ring 223, shown in perspective in Fig. 14 and in section in Fig. 10, sur rounds the selector levers near the lower end. A conductor 225 is attached to one of the supports 225 that hold the flexible ring 223 in position. This conductor 224 is connected to conductor 205, Fig. 9, which is connected to the power supply unit through contacts 252 and 2% and armature 2M of relay R8. When one of the selector levers is moved toward its associated magnet by the action of such magnet, the lower portion of such lever engages flexible ring 223 as shown in Fig. 10 where selector lever Wle is pictured in such engaged position. Current then flows from the power supply unit through conductors 27d, 8 3d, 82d, 26!], 266, 213, contact 253, armature 2M, contact 262, conductors 285 and 224,

' support 22 5, ring 223, selector lever Wle, spring 228, ring 226, conductor 22?, solenoid 2H5, and then to ground bymeans of conductor 228. The resultant current flow through the solenoid m of course operates the solenoid, but not until after the selector lever has been pulled out of its normal alignment with its associated hole 22!. When plunger 2!? draws downward in response to-the action of the energized solenoid 2H5, the outer portion of the driving disc 2E9 will engage the upper end of selector lever Wie; but the upper ends of none of the other selector levers will be r engaged because they will pass through their associated holes 221, as indicated in Fig. 13 where selector lever Wtc is shown passing through its associated hole 22! in the driving disc. It will be noted in Fig. 13 that selector lever Wle has been pushed downward against the action of its keeper spring 226. As shown in Fig. 13, the projection Y], of course, moves downward out of alignment with the core of its associated magnet XI. Inasmuch as this greatly reduces the flux between the magnet core and projection Y: or any other part of the selector lever Wle, there might be a tendency of keeper spring 226 to pull the lever W 16 toward the solenoid and away from magnet Xi. To prevent this from happening, an annular projection or head can is formed on the lower side of disc 219 as shown in Figs. 13, 10 and 12. This projection prevents the upper end of any of the levers from slipping back into alignment with its associated hole after it has initially been drawn out of such alignment by the action of its associated magnet. When any selector lever is pushed downward by the driving disc 219, its associated rod will, of course, engage the push button with which it is aligned.

In Fig. 13 rod Vic has engaged push button Ble and pushed it down to an operated position, but it will be noted that there has been no engagement between rod V6c and its associated push button BBe because selector rod Wiie was not attracted by its associated magnet and therefore the upper end of the latter selector lever remained in its rest position with its associated hole 22l passing down over the lever. When the plunger has reached the downward end of its stroke, as shown in Fig. 13, the cap Qe engages contact Te connected to conductor I99e, which corresponds to conductor I99 shown in Fig. 9. This operates the latching magnet R8 in order, indirectly, to de-energize magnet XI and solenoid 2H5. As plunger 2|! is pulled upward by the action of the keeper spring 2l8, cap Q3 engages the under side 01" rocker Us. This rocker is normally held in a horizontal position by means of spring 229, which is connected to conductor l92e. The latter conductor is connected to the stepping magnet l9d of Fig. 9. The action of this stepping magnet advances the rotary contacts of the stepping switch to the next stationary contact. This, in turn, completes a circuit through the patch panel lei) to another of the magnets of the X series in Fig. 12 and another selector lever is operated by means of the solenoid BIS in the manner previously described.

Inasmuch as the instant species is the same as that of Fig. 9 excepting for the substitution of the magnets and solenoids in Figs. 10, 12 and 13 for the solenoids of the Fig. 9 species, it will readily be understood that the stepping switch and other components will cause the proper push buttons of the instant species to be operated in proper sequence until the desired number has been called.

In the instant species the magnets of the X series may, of course, be small because their only function is to pul the selector levers into a position where they will be engaged by the driving disc 2 l9. Solenoid 2 I6 is, of course, more powerful and should, in fact, be more powerful than the solenoids of the Fig; 9 species because it must not only operate one push button at a time but must overcome the simultaneous action of t o keeper sprin s. These are the keeper springs 2| 8 of the plunger Ell and the keeper spring of the particular selector lever that is being operated at any given time.

The rocker Ue, as Figs. 10 and 13 indicate, is constructed the same as the rockers U6 to U9 and U of the Fig. 9 species. I When cap Qe moves downward it therefore strikes the insulated portion of the tip of the rocker and consequently no circuit is completed from cap Qe to rocker Ue on the downward stroke.

In order to prevent plunger 2 l1 and the driving disc 2l9 from pressing the telephone buttons in too rapid sequence, the soenoid 2H3 may be equ pped with a dash-pot as explained herein in connection with other solenoids, or the necessary delaying action can be effected by any other means, either mechanical or electrical, as for instance by electronic devices that are well known for such purpose.

The foregoing specification has described only illustrated improvements of my invention and it is not my intentionto be limited to any'of these forms. Various substitutions may be made for any of the components, either individually or collectively, and my invention contemplates the substitution of any of the elements of the appended claims by other elements that are capable of performing the same function as that of the element omitted.

I claim:

1. In apparatus for automatically calling a preselected telephone number on a dial telephone, a combination including: a first means'for engaging the regular telephone line button for switching the telephone in and out of circuit; a second means comprising a mechanical dialing finger adapted to rotate in a circle concentric with the telephone dial for rotating'the same; electro-responsive means for moving said finger into any of the openings in said dial; a third means for moving said finger out of any of said openings upon the tie-energizing of said electroresponsive means; commutating means comprising a difierent electrical contact for each of the openings in said dial; a conducting brush adapted successively to move over and engage said contacts; means whereby the movement of said brush is synchronized with the movement of said finger so that said brush will engage each contact while said finger is in registry with the corresponding. opening in said dial; means for pre-selecting which of said contacts will be energized during specific cycles of movement of said brush; and means for energizing said EIBCtIO-IESPOIISiVG means upon completion of a circuit between any of said contacts and said brush so that said finger during specific cycles of its rotation will move into the dial opening corresponding to the contact that is energized during the corresponding cycle of movement of said brush.

2. In apparatus for automatically calling a preselected telephone number on a dial telephone, a combination including: a first means for engaging the regular telephone line button for switching the telephone in and out of circuit; a second means comprising a mechanical dialing finger adapted to rotate in a clockwise direction only, and to describe a circle concentric with the telephone dial; electro-responsive means for moving said finger into any of the openings in said dial; a third means for moving said finger out of any of said openings upon the de-energizing of said electro-responsive means; commutating means comprising a different electrical contact for each of the openings in said dial; a conducting brush adapted successively to traverse said contacts; means whereby the movement of said brush is synchronized with the movement of said finger so that said brush will engage each of said contacts while said finger is directly over the corresponding opening in said dial; a step switch having a plurality of stationary contacts and a wiping contact for engaging said stationary contacts manual means for connecting said stationary contacts selectively to any of the aforementioned contacts of said commutating means; and means for energizing said electro-respons'ive means upon completion of a circuit between any of said commutator contacts and said brush so that said finger during specific cycles of its rotation will move into the dial opening corresponding to the commutator contact that is then energized by said step switch.

3. In apparatus for automatically calling a preselected telephone number on a dial telephone, a combination including; a first means for engaging the regular telephone line button for switching the telephone in and out of circuit; a'sec'ond means comprising a mechanical dialing finger adapted to rotate in a clockwise direction only, and to describe a circle concentric with the telephone dial; electro-responsive means for moving said finger into any of the openings in said dial; a third means for moving said finger out of any of said openings upon the de-energizing. of said electro-responsive means; commutating. means comprising at least as many electrical contacts as there are finger openings in said dial; econducting brush adapted successively to traverse said contacts; means whereby the movement of said brush is synchronized with the movement of said finger so that said brush will engage each of said contacts while said finger is directly over a different opening in said dial; a step switch having a plurality of stationary contacts and a wiping contact for engaging said stationary contacts; means for successively advancing said wiping contact from one of said stationary contacts to the next each time said finger has completed a revolution; manually operable means for connecting said stationary contacts selectively to any one of the aforementioned contacts of said commutating means; and means for energizing said elec-tro-responsive means upon completion of a circuit between any of said commutator contacts and said brush so that said finger during specific cycles of its rotation will move into the dial opening. associated with the commutator contact that is then energized by the wiping contact of said step switch.

- 4; In apparatus for automatically calling a preselected telephone number on a dial telephone, a combination including: a first means for engaging the regular telephone line button for switching the telephone in and out of circuit; a second means comprising a mechanical dialing finger adapted to rotate in a clockwise direction only, and to describe a circle concentric with the telephone dial; electro-responsive means for moving said finger into any of the openings in said dial; a third means 'for moving said finger out of any of said openings upon the d e-energizing of said electro-responsive means; commutating means comprising a different electrical contact for each of the openings in said dial and at least one more electrical contact; a conducting brush adapted successively to traverse said contacts; means whereby the movement of said brush is synchronized with the movement of said finger so that said brush will engage all but one of said contacts while said finger is directly over a different opening in said dial; a step switch having a plurality of stationary contacts and a wiping contact for successively engaging and energizing said stationary contacts; manually operable means 7 for connecting said stationary contacts selectively to all but one of the aforementioned contacts of said commutating means; means for energizing said electro-responsive means upon the engagement of said brush with the particular commutator contact that is then connected to the stationary contact then being engaged by said wiping contact; and means for de-energizing said electro-responsive means when said conducting brush is in engagement with a contact of said commutator that is not associated with an opening in said dial.

5. In apparatus for use with an automatic telephone having a plurality of finger-actuatable means each specific to one of the digits from 1 to 9 and 0, a combination including: electro-responsive means for selectively engaging and operating said finger-actuata-ble means; selectively energizable means each specific to one of said fingeractuatable means and each acting when electri-.

cally energized to cause the finger actuatable means that is specific thereto to be engaged and operated by said electro-responsive means; a step switch having a plurality of stationary contacts and a wiping contact for engaging said stationary contacts; manually operable means for connecting each of said stationary contacts selectively to any one of said selectively energizable means;

and means for successively advancing said wiping contact from one of said stationary contacts to the next after each successive operation of said electro-respcnsive means.

6. In apparatus for use with an automatic telephone having a plurality of finger-actuatable means each specific to one of the digits from 1 to 9 and 0, a combination including: electroresponsive means for selectively engaging and operating said finger-actuatable means; selectively energizable means each specific to one of said finger-actuatable means and each acting when electrically energized to cause the fingeractuatable means that is specific thereto to be engaged and operated by said electro-responsive means; a step switch having a plurality of stationary contacts and a wiping contact for engaging said stationary contacts, manually operable means for connecting each of said stationary contacts selectively to any one of said selectively energizable means; means for successively advancing saidwiping contact from one of said stationary contacts to the next after each successive operation of said electro-responsive means; and means for returning said wiping contact to a rest position out of engagement with any of said stationary contacts after a predetermined number of operations of said electro-responsive means.

7. In apparatus for use with an automatic telephone having a plurality of finger-actuatable means each specific to one of the digits from 1 to 9 and 0, a combination including: electroresponsive means for selectively engaging and operating said finger-actuatable means; selectively energizable means each specific to one of said finger-actuatable means and each acting when electrically energized to cause the fingeractuatable means that is specific thereto to be engaged and operated by said electro-responsive means; a step switch comprising first and second decks each having a plurality of stationary contacts and a wiping contact for engaging said stationary contacts; manually operable means for connecting each of the stationary contacts of the first deck to any one of said selectively energizable means; means including a stepping magnet for successively advancing the wiping contacts of both decks from one stationary contact to the next after each successive operation of said electro-responsive means; electro-magnetic means for returning the wiping contacts to a rest position out of engagement with any of said stationary contacts; and manually operable means for selectively connecting certain stationary contacts of said second deck to said electro-magnetic means so that a circuit may be completed to said electro-magnetic means when the wiping contact of said second deck makes engagement with the particular stationary contact of said second deck that has been connected to said electro-magnetic means.

8. In apparatus for use with an automatic telephone having a plurality of finger-actuataole means each specific to one of the digits from 1 to 9 and 0, a combination including: a first means engageable with the telephone line button for switching the telephone in and out of circuit; electro-responsive means for selectively engaging and operating said finger-actuatable means; selectively energizable means each specific to one of said finger-actuatable means and each acting when electrically energized to cause the fingeractuatable means that is specific thereto to be engaged and operated by said electro-responsive 

